Parathlasia guizhouensis Li, Jiang, Li & Xing, sp. nov.

Medium-sized, 7.5–8.0 mm long (including tegmen); yellowish to sordid brown. Head (Fig. 1A, B) with crown declivous, in dorsal view nearly twice as long and five times wider than eye; median carina complete but weakly elevated, weakly concave either side of midline, with some granular protuberances; ocelli (Fig. 1A) submarginal and close to posterior margin, closer to midline than corresponding eyes. Face (Fig. 1C) including eyes shorter than wide; frontoclypeus flattened. Pronotum slightly wider than head with anterior margin slightly convex, lateral margins oblique, slightly divergent posteriorly. Metanotum (Fig. 1A) two-thirds length of pronotum with distinct transverse depression. Forewing (Fig. 1A, B, D) with apical margin strongly oblique, three subapical cells, inner subapical open, middle subapical closed, extra apical cells present; appendix very narrow. Hind leg as in Fig. 1F, H.

Male pygofer (Fig. 2A, E) with long ventrocaudal process; with some small stout setae subapically. Xth segment very short. Subgenital plates (Fig. 2A, H) fused basally, elongate, inner margin with short spine-like setae. Aedeagus (Fig. 2B, C, F, I) with shaft somewhat elongate, tubular, curved dorsally with a ventral medial process, gonopore apical on ventral surface; basal apodeme distinct. Style (Fig. 2C, D, F, I) elongate, apophysis curved ventrally, apex truncate. Connective (Fig. 2C, F, I) T-shaped.

Figure 2. 

Male genitalia of Parathlasia guizhouensis sp. nov. A genital capsule, lateral view B aedeagus, lateral view C aedeagus, connective and style, ventral view D right style, lateral view E pygofer, lateral view F aedeagus, connective and style, lateral view G apex of abdomen, ventral view H subgenital plate I aedeagus, connective and style, ventral view.

Female unknown.

China (Guizhou) (Fig. 3).

Figure 3. 

Distribution of Parathlasia guizhouensis sp. nov.

The name of the new genus refers to the similarity of the genus to Thlasia Germar externally.

The new genus is similar in appearance to Thlasia Germar, Midoria Kato and Yelahanka Viraktamath, Webb & Yeshwanth in its relatively small size with a short head and with similar extra apical forewing veins but lacking accessory cross veins. In addition, the oblique forewing apex in Parathlasia is also found in some species of Yelahanka (see Viraktamath et al. 2021) and long ventrocaudal pygofer process is found also in some species of Thlasia (see Zhang et al. 2004). It differs from these and other Ledrinae in having the aedeagus with a single ventral medial process (Fig. 2B, F); Midoria has paired ventral processes on the aedeagus (Li and Li 2010, 2011).

The new genus also appears closely related to Parapetalocephala Kato. The main difference between Parathlasia and Parapetalocephala are the forewing veins which in the later genus are prominent (see Jones and Deitz 2009).

Head (Fig. 1A) yellowish brown, base of crown with some darker brown marking, ocelli reddish brown. Thorax sordid brown; forewings (Fig. 1A, B, C, D) yellowish hyaline apically margined with brown.

Crown flat, more or less horizontal, surface punctate with median short ridge on posterior margin, about 0.4 times as long as wide between eyes. Ocelli not prominent, closer to each other than to adjacent eye. Pronotum shallowly foveate on either side of median line in anterior half, posterior half slightly gibbous, anterior margin slightly convex, posterior margin medially concave, lateral margin somewhat straight, about 1.85 times as long medially as crown. Mesonotum shorter than pronotum. Forewing claval region densely punctate, apical margin obliquely truncate.

Pygofer anterior margin deeply bilobed, posterior margin slightly sinuate, in lateral view about 1.2 times as long as height, ventro-cauadal process long, extending beyond dorsal pygofer margin, with some conical protrusions at end of ventral margin. Subgenital plate widest in mid-region tapering both anteriorly and posteriorly, apex acutely angled. Style broad in middle region, tapering forward and backward, apophysis curved ventrally with axe shaped apex. Aedeagal shaft (Fig. 2B, C, F, I) bifurcate apically; ventral processes elongate, curved dorsally, longer than shaft. Other male genitalia characteristics as in Figs 1 and 2.

The characteristics of female are unknown.

Length (including tegmen): ♂, 7.5–8.0 mm.

Holotype : ♂, China: Guizhou, Fanjingshan, Huguosi, 29 May 2002, coll. Li Zizhong (QFNU). Paratypes: 6♂♂, same data as holotype; 2♂♂, same data as holotype except 29 July 2001, coll. Yang Maofa (GUGC); 1♂, China: Guizhou, Leigonghan, Lianhuaping, 2 June 2005, coll. Li Zizhong and Zhang Bin (GUGC) (see Fig. 3 for geographic distributions of new species).

Unknown.

The species name is derived from the type locality.